/in/foo.cc: In function 'int read()':
/in/foo.cc:20:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(; isdigit(ch); ch = getchar()) x = x * 10 + ch - '0'; return x * f;
  ^~~
/in/foo.cc:20:60: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(; isdigit(ch); ch = getchar()) x = x * 10 + ch - '0'; return x * f;
                                                            ^~~~~~
/in/foo.cc: In function 'int addflow(int, int)':
/in/foo.cc:51:9: warning: 'add' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return add;
         ^~~